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/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkWindowConvergenceMonitoringFunction_hxx
#define itkWindowConvergenceMonitoringFunction_hxx
#include "itkBSplineControlPointImageFunction.h"
#include "itkBSplineScatteredDataPointSetToImageFilter.h"
#include "itkImage.h"
#include "itkPointSet.h"
#include "itkVector.h"
namespace itk
{
namespace Function
{
template <typename TScalar>
WindowConvergenceMonitoringFunction<TScalar>::WindowConvergenceMonitoringFunction()
: m_WindowSize(10)
, m_TotalEnergy(0)
{}
template <typename TScalar>
void
WindowConvergenceMonitoringFunction<TScalar>::AddEnergyValue(const EnergyValueType value)
{
itkDebugMacro("Adding energy value " << value);
this->m_EnergyValues.push_back(value);
if (this->GetNumberOfEnergyValues() > this->m_WindowSize)
{
this->m_EnergyValues.pop_front();
}
this->m_TotalEnergy += itk::Math::abs(value);
this->Modified();
}
template <typename TScalar>
void
WindowConvergenceMonitoringFunction<TScalar>::ClearEnergyValues()
{
Superclass::ClearEnergyValues();
this->m_TotalEnergy = RealType{};
}
template <typename TScalar>
auto
WindowConvergenceMonitoringFunction<TScalar>::GetConvergenceValue() const -> RealType
{
if (this->GetNumberOfEnergyValues() < this->m_WindowSize)
{
return NumericTraits<RealType>::max();
}
using ProfilePointDataType = Vector<RealType, 1>;
using CurveType = Image<ProfilePointDataType, 1>;
using EnergyProfileType = PointSet<ProfilePointDataType, 1>;
using ProfilePointType = typename EnergyProfileType::PointType;
typename CurveType::PointType origin;
typename CurveType::SizeType size;
typename CurveType::SpacingType spacing;
origin[0] = 0.0;
size[0] = 11;
spacing[0] = 0.1;
using BSplinerType = BSplineScatteredDataPointSetToImageFilter<EnergyProfileType, CurveType>;
auto bspliner = BSplinerType::New();
bspliner->SetOrigin(origin);
bspliner->SetSpacing(spacing);
bspliner->SetSize(size);
bspliner->SetNumberOfLevels(1);
bspliner->SetSplineOrder(1);
typename BSplinerType::ArrayType ncps;
ncps.Fill(bspliner->GetSplineOrder()[0] + 1);
bspliner->SetNumberOfControlPoints(ncps);
bspliner->SetNumberOfWorkUnits(1);
auto energyProfileWindow = EnergyProfileType::New();
energyProfileWindow->Initialize();
for (unsigned int n = 0; n < this->m_WindowSize; ++n)
{
ProfilePointType windowPoint;
windowPoint[0] = static_cast<typename ProfilePointType::CoordRepType>(n) /
static_cast<typename ProfilePointType::CoordRepType>(this->m_WindowSize - 1);
energyProfileWindow->SetPoint(n, windowPoint);
energyProfileWindow->SetPointData(n, ProfilePointDataType(this->m_EnergyValues[n] / this->m_TotalEnergy));
}
bspliner->SetInput(energyProfileWindow);
bspliner->Update();
using BSplinerFunctionType = BSplineControlPointImageFunction<CurveType>;
auto bsplinerFunction = BSplinerFunctionType::New();
bsplinerFunction->SetOrigin(origin);
bsplinerFunction->SetSpacing(spacing);
bsplinerFunction->SetSize(size);
bsplinerFunction->SetSplineOrder(bspliner->GetSplineOrder());
bsplinerFunction->SetInputImage(bspliner->GetPhiLattice());
ProfilePointType endPoint;
endPoint[0] = NumericTraits<RealType>::OneValue();
typename BSplinerFunctionType::GradientType gradient = bsplinerFunction->EvaluateGradientAtParametricPoint(endPoint);
RealType convergenceValue = -gradient[0][0];
return convergenceValue;
}
/**
* Standard "PrintSelf" method
*/
template <typename TScalar>
void
WindowConvergenceMonitoringFunction<TScalar>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "Window size: " << this->m_WindowSize << std::endl;
}
} // end namespace Function
} // end namespace itk
#endif
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